如何对使用FormsAuthentication的ASP.NET MVC控制器进行单元测试？

[TestMethod]
public void TestLogin()
{
    // 创建一个模拟的HttpContext对象
    var httpContext = new Mock<HttpContextBase>();
    // 创建一个模拟的ControllerContext对象
    var controllerContext = new Mock<ControllerContext>();
    // 创建一个模拟的MembershipProvider对象
    var membershipProvider = new Mock<MembershipProvider>();

    // 设置HttpContext对象的模拟行为
    httpContext.Setup(x => x.User.Identity.Name).Returns("testuser");
    httpContext.Setup(x => x.Request.IsAuthenticated).Returns(true);

    // 设置ControllerContext对象的模拟行为
    controllerContext.Setup(x => x.HttpContext).Returns(httpContext.Object);

    // 创建一个MyController对象，并将其ControllerContext设置为模拟的ControllerContext对象
    var controller = new MyController();
    controller.ControllerContext = controllerContext.Object;

    // 调用MyController的Login方法，并验证其返回值
    var result = controller.Login() as RedirectToRouteResult;
    Assert.AreEqual("Index", result.RouteValues["action"]);
}